**To change an IAM role's description**

The following ``update-role`` command changes the description of the IAM role ``production-role`` to ``Main production role``. ::

  aws iam update-role-description --role-name production-role --description 'Main production role'

  Output::

  {
      "Role": {
          "Path": "/",
          "RoleName": "production-role",
          "RoleId": "AROA1234567890EXAMPLE",
          "Arn": "arn:aws:iam::123456789012:role/production-role",
          "CreateDate": "2017-12-06T17:16:37+00:00",
          "AssumeRolePolicyDocument": {
              "Version": "2012-10-17",
              "Statement": [
                  {
                      "Effect": "Allow",
                      "Principal": {
                          "AWS": "arn:aws:iam::123456789012:root"
                      },
                      "Action": "sts:AssumeRole",
                      "Condition": {}
                  }
              ]
          },
          "Description": "Main production role"
      }
  }

For more information, see `Modifying a Role`_ in the *AWS IAM User's Guide*.

.. _`Modifying a Role`: https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_manage_modify.html